( Reaffirmed 2003 ) Indian Standard METHODS OF TEST FOR COATED AND TREATED FABRICS PART 10 RUBBEROR PLASTICS-COATED FABRICS LOW-TEMPERATURE BEND TEST ( First Revision ) ICS 59.080.40; 59.100.99 @ BIS 1997 BUREAU MANAK OF BHAVAN, INDIAN STANDARDS ZAFAR MARG 9 BAHADUR SHAH NEW DELHI 110002 November 1997 Price Group 3 Rubber Products Sectional Committee, PCD 13 NATIONAL FOREWORD This'lndian Standard (First Revision) which is identical with IS0 4675 : 1990 `Rubber- or plasticscoated fabrics - Low temperature bend test' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of Rubber Products Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council. Bend test at low temperature is designed for determining the ability to resist cracking or fracturing of coating of fabrics coated with rubber or plastics when exposed for definite period at specified temperature. This standard was first published in 1981 based on earlier version of International Standard namely IS0 4675 : 1979. In this revisio,? modifications required to the standard equipment so as to make it applicable to material with a thickness greater than 2.2 mm have been incorporated. Besides this, requirement for conditioning of gloves and a detailed clause for assessment of damage have been added. Modifications have also been made in the requirement of time period between manufacture and testing. The text of IS0 standard has been approved as suitable for publication as Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) b) Wherever the words `International Standard' appear referring to this standard, they should be read as `Indian Standard'. Comma (,),has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker. In this adopted standard reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their place are listed below along with their degree of equivalence for the editions indicated: International Standard IS0 2231 : 1989 Rubber- or plastics-coated fabrics - Standard atmospheres for conditioning and testing IS0 2286 : 1986 Rubber- or plastics-coated fabrics - Determination of roll characteristics Corresponding Indian Standard IS 196 : 1966 Atmospheric conditions for testing (revised) Degree of EQuivalence Technically equivalent IS 7016 (Part 1) : 1982 Methods of test for coated and treated fabrics: Part 1 Roll characteristics (first revision) do For tropical countries like India, the standard temperature and the relative humidity shall be taken as 27 f 2'C and 65 f 5 percent respectively. In reporting the results of a test or analysis made in accordance with this standard, if the final value, observed or calculated, is to be rounded off, it shall be done in accordance with IS 2 : 1960 `Rules for rounding off numerical values (revised)`. IS 7016 (Part 10) : 1997 ISO 4675 : 1990 Indian Standard METHODS OF TEST FOR COATED AND TREATED FABRICS PART 10 RUBBER- OR PLASTICS-COATED FABRICS LOW-TEMPERATURE BEND TEST ( First Revision) jection of the test pieces to a bend test, using an appropriate apparatus, and examination of the test pieces. 1 Scope This international Standard specifies a method for determining the ability of fabrics coated with rubber or plastics to resist the effect of low temperature when subjected to bending at specified temperatures after definite periods of exposure. It is applicable to material with a thickness within the range $1 mm to 2,2 mm. For materials of greater thickness than this, modifications to the standard equipment are necessary (see 8.2, third paragraph). Because fabrics coated with rubber or plastrcs are in different applications requiring lowused temperature flexing, no general relationship between this test and service performance can be given or implied. 4 Apparatus 4.1 Cold chamber, in which the test pieces are exposed to low temperature, sufficient in size to contain the bending fixture used for testing the test pieces and to permit the operation of the fixture to bend the test piece without removal from the chamber. The cold chamber shall also have sufficient work space to permit the conditioning of test pieces as outlined in clause 7. It shall be capable of maintaining a uniform atmosphere of cold air or any to other suitable gas at specified temperatures within a tolerance of) 1 `C. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 2231:1989, Rubber- or plastics-coated fabrics Standard atmospheres for conditioning and testing. IS0 2286:1986, Rubber- or plasfics-coated Determination of roll characteristics. fabrics - 4.2 Bending jig. for bending shown in figure 1 and figure 2. Masses, mass tolerances as specified in figure 2. the test pieces, as and dimensions shall be 4.3 Glass plates, of sufficient number, having dimensions of approximately 125 mm x 175 mm, for use when conditioning all test pieces. The thickness of the glass plates shall be such as to permit easy handling. 4.4 Gloves, for handling chamber. 3 test pieces within the cold , Principle Conditioning of test pieces in a specified atmosphere, followed by exposure for a specified time in a cold chamber with a specified atmosphere. Sub- The gloves will be conditioned at the same temperature as the test pieces. A second pair of gloves at room temperature shall therefore be available for wearing within the cold gloves as protection for the operator. IS 7016 (Part 10) : 1997 IS0 4675 : 1990 5 Test pieces Take three test pieces, each measuring 25 mm x 100 mm, equally spaced across the working width of the sample and with their lengths parallel to the longitudinal direction of the coated fabric, unless otherwise specified. When materials greater than 2,2 mm in thickness are to be tested, it may be necessary to increase the mass of the steel top bar (; (see figure2) and increase the clearance between the back plate and mandrel to enable the specimen to be inserted. In this case, report the deviation in the test report. 8.3 As soon as the test piece is in position in the bending jig, release the trigger and permit the flexing plate to make a free fall. 8.4 After all the test pieces have been tested, remove them from the test chamber and examine each test piece for fractures or cracks in their coating under a magnification of x5. During the examination, fold all test pieces through 180" in the same direction as the bend made during the test. 6 Time-interval testing between manufacture and 6.1 For all test purposes, the minimum time tween manufacture and testing shall be 16 h. be- 6.2 For non-product tests, the maximum time between manufacture and testing shall be 4 weeks; for evaluations intended to be comparable, each test, as far as possible, shall be carried out after the same time-interval. 6.3 For product tests, whenever possible, the time between manufacturing and testing shall not exceed 3 months. In'other cases, tests shall be made within 2 months of the date of receipt of the products by the customer. 9 9.1 Assessment Depth of damage of crack if any, according to the following Grade the cracking, five-part scale. 7 Conditioning of test pieces A - surface or finish crack not exposing lular layer, middle layer or substrate; 6 - cracking layer; C - cracking fabric; D0 9.2 cracking into but not through the the cel- Immediately prior to testing, condition the test pieces in one of the standard atmospheres defined in IS0 2231. middle through to the substrate or base 6 Procedure 8.1 Measure the thickness of each test specimen in accordance with IS0 2286. Place the three conditioned test pieces between glass plates (4.3), with sufficient space between each test piece to permit the passage of air during the conditioning period. Place the glass plates with the test pieces held in position, the bending jig (4.2) and the cold gloves (4.4) in the cold chamber (4.1). Unless otherwise specified, expose them for 4 h to the specified test temperature. 8.2 At the termination of the exposure period and without taking them out of the test chamber, remove the test pieces from between the glass plates one at a time (CAUTION, see below) and place in the bending jig with the flexing plate held in the open position by the trigger pin. Unless otherwise specified, in the case of substrates coated on one side only, place the coated side away from the mandrel. In the case of double-coated fabrics, either or both surfaces may be evaluated unless otherwise specified. CAUTION - Gloves must be worn at all times when handllng test pieces prior to making the bend test. completely through the material; no cracking. of cracks Number Record the number of cracks of greatest severity, up to 10. If there are more than 10, record "over 10". 9.3 Length of crack of the largest Record the length, in millimetres, crack of greatest severity. 10 Test report report shail include the following partic- The test ulars: a) a reference to this International atmophere Standard; 7); b) the conditioning used (see clause IS 7016 (Part 10) : 1997 IS0 4675 : 1990 c) the thickness sure at which d) the temperature tested; e) the duration f) the surface(s) of the coated fabric it was measured; at which and the pres- g) the depth of crack in accordance with the fivepart scale in 9.1, the number of cracks and the length of the largest crack in each test piece; h) details of any deviations from the standard test; the test pieces were of the exposure tested; period; i) all details necessary,for coated fabric, including, manufacture; the date of the test. the identification of the if possible, the date of j) IS 7016 ( Part 10) IS0 4675 : 1990 : 1997 Test piece :.:.:.:.:.:.:.:.:.:.:.:. .~.`.`.`.`.`.`.`.~.~.`. - Figure 1 - Bending jig for coated fabrics IS 7016 (Part 10) : 1997 ISO 4675 : 1990 mm A 13 G: Steel mass loo x 25 x 13 H: Aluminium \ \ d Coated-fabric test piece `\ \ i F: Aluminium stationary ----. bending plate / // I /' Support base ---_) c, \ `--\\ ,' ! I / C Figure 2 - Dimenslons of bending jig 5 Bureau of Indian Standards BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country. Copyright BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director (Publications), BIS. Review of Indian Standards Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of `BIS Handbook' and `Standards: Monthly Additions'. This Indian Standard has been developed from Dot : No. PCD 13 ( 1450 ). 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